/**
 *  json2Form    
 *  json转  如 a=b&b=C
 */
module.exports = (json) => {
    var str = []
    for (var p in json) {
    
      str.push(encodeURIComponent(p) + "=" + encodeURIComponent(json[p]))
    }
    return str.join("&")
}
